document.write('<span class="js-cursor-container"></span>');

(function fairyDustCursor() {

	var possibleColors = ["#D61C59", "#E7D84B", "#1B8798"]
	var width = window.innerWidth;
	var height = window.innerHeight;
	var cursor = { x: width / 2, y: width / 2 };
	var particles = [];

	function init() {
		bindEvents();
		loop();
	}


	function bindEvents() {
		document.addEventListener('mousemove', onMouseMove);
		window.addEventListener('resize', onWindowResize);
	}

	function onWindowResize(e) {
		width = window.innerWidth;
		height = window.innerHeight;
	}

	function onMouseMove(e) {
		cursor.x = e.clientX;
		cursor.y = e.clientY;

		addParticle(cursor.x, cursor.y, possibleColors[Math.floor(Math.random() * possibleColors.length)]);
	}

	function addParticle(x, y, color) {
		var particle = new Particle();
		particle.init(x, y, color);
		particles.push(particle);
	}

	function updateParticles() {


		for (var i = 0; i < particles.length; i++) {
			particles[i].update();
		}


		for (var i = particles.length - 1; i >= 0; i--) {
			if (particles[i].lifeSpan < 0) {
				particles[i].die();
				particles.splice(i, 1);
			}
		}

	}

	function loop() {
		requestAnimationFrame(loop);
		updateParticles();
	}



	function Particle() {

		this.character = "*";
		this.lifeSpan = 120; //ms
		this.initialStyles = {
			"position": "fixed",
			"display": "inline-block",
			"top": "-12px",
			"left": "-8px",
			"pointerEvents": "none",
			"touch-action": "none",
			"z-index": "10000000",
			"fontSize": "25px",
			"will-change": "transform"
		};


		this.init = function (x, y, color) {

			this.velocity = {
				x: (Math.random() < 0.5 ? -1 : 1) * (Math.random() / 2),
				y: 1
			};

			this.position = { x: x + 10, y: y + 10 };
			this.initialStyles.color = color;

			this.element = document.createElement('span');
			this.element.innerHTML = this.character;
			applyProperties(this.element, this.initialStyles);
			this.update();

			document.querySelector('.js-cursor-container').appendChild(this.element);
		};

		this.update = function () {
			this.position.x += this.velocity.x;
			this.position.y += this.velocity.y;
			this.lifeSpan--;

			this.element.style.transform = "translate3d(" + this.position.x + "px," + this.position.y + "px, 0) scale(" + (this.lifeSpan / 120) + ")";
		}

		this.die = function () {
			this.element.parentNode.removeChild(this.element);
		}

	}


	function applyProperties(target, properties) {
		for (var key in properties) {
			target.style[key] = properties[key];
		}
	}

	if (!('ontouchstart' in window || navigator.msMaxTouchPoints)) init();
})();